Back massager attachment



FIG. 1 is a perspective view of a back massager attachment showing my new design;

FIG. 2 is a side elevational view showing one side of the back massager attachment of my new design, the side elevational view of the other side being a mirror image of the side shown;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevation view thereof. 

The ornamental design for a back massager attachment, as shown and described. 